By analyzing blood samples drawn from U.S. marines who have served in battle zones, a group of analysts has spotted genetic markers that are associated with post-traumatic stress disorder (PTSD).

For their study published in the Molecular Psychiatry journal on March 10, Dewleen Baker from the University of California, San Diego and colleagues investigated the blood samples of 188 marines from the U.S. The specimens were taken prior to and after the deployment of the marines to conflict zones...